Table 1

Item scaling tests: convergent validity for DLQI scales

Scale

No. of items per scale

Convergent validity (range of correlation)

Scaling Success1

Scaling Success Rate2

Internal consistency (Cronbach's α)


SF

2

0.69–0.78

2/2

100

0.70

DA

2

0.71–0.78

2/2

100

0.76

L

2

0.67–0.88

2/2

100

0.71

WS

1

1.00

1/1

100

1.00

PR

2

0.50–0.99

2/2

100

0.79

T

1

1.00

1/1

100

1.00


SF (Symptoms and feelings), DA (Daily activities), L (Leisure), WS (Work and School),PR (Personal relationships), T (Treatment) 1- Number of correlation between items and hypothesized scale corrected for overlap ≥ 0.4/ total number of convergent validity tests. 2- Scaling success rate is the previous column as a percentage.

Aghaei et al. BMC Dermatology 2004 4:8   doi:10.1186/1471-5945-4-8

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